A national Bengali word that came from local area, and now using country wide, as parliament declared it is not a slang.
Chudur-budur (sudur-budur) is probably a Noakhailya word/phrase and it's definitely not vulgar.

Although some people believe that this chudurbudur made up with two separate words, which are Chudur+ Budur. The first one which is Chudur means fuck, and the Budur means Vagina, however dictionary says something else than this. It is not clear that this word has vulgar attitude, but surely the higher class people do not want to use this word.